github.com/pawelgaczynski/gain@v0.4.0-alpha.0.20230821120126-41f1e60a18da/read.go (about)

     1  // Copyright (c) 2023 Paweł Gaczyński
     2  //
     3  // Licensed under the Apache License, Version 2.0 (the "License");
     4  // you may not use this file except in compliance with the License.
     5  // You may obtain a copy of the License at
     6  //
     7  //     http://www.apache.org/licenses/LICENSE-2.0
     8  //
     9  // Unless required by applicable law or agreed to in writing, software
    10  // distributed under the License is distributed on an "AS IS" BASIS,
    11  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    12  // See the License for the specific language governing permissions and
    13  // limitations under the License.
    14  
    15  package gain
    16  
    17  import (
    18  	"github.com/pawelgaczynski/gain/pkg/errors"
    19  	"github.com/pawelgaczynski/giouring"
    20  )
    21  
    22  type reader struct {
    23  	ring    *giouring.Ring
    24  	recvMsg bool
    25  }
    26  
    27  func (r *reader) addReadRequest(conn *connection) error {
    28  	entry := r.ring.GetSQE()
    29  	if entry == nil {
    30  		return errors.ErrGettingSQE
    31  	}
    32  
    33  	conn.inboundBuffer.GrowIfUnsufficientFreeSpace()
    34  
    35  	if r.recvMsg {
    36  		entry.PrepareRecvMsg(conn.fd, conn.msgHdr, 0)
    37  		entry.UserData = readDataFlag | uint64(conn.key)
    38  	} else {
    39  		entry.PrepareRecv(
    40  			conn.fd,
    41  			uintptr(conn.inboundWriteAddress()),
    42  			uint32(conn.inboundBuffer.Available()),
    43  			0)
    44  		entry.UserData = readDataFlag | uint64(conn.fd)
    45  	}
    46  
    47  	conn.state = connRead
    48  	conn.setKernelSpace()
    49  
    50  	return nil
    51  }
    52  
    53  func newReader(ring *giouring.Ring, recvMsg bool) *reader {
    54  	return &reader{
    55  		ring:    ring,
    56  		recvMsg: recvMsg,
    57  	}
    58  }